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musl - an implementation of the standard library for Linux-based systems
97c5b5a87c
previously, a waiter could miss the 1->0 transition of block if another thread set block to 1 again after the signal function set block to 0. we now use the caller's thread id as a unique token to store in block, which no other thread will ever write there. this ensures that if block still contains the tid, no signal has occurred. spurious wakeups will of course occur whenever there is a spurious return from the futex wait and another thread has begun waiting on the cond var. this should be a rare occurrence except perhaps in the presence of interrupting signal handlers. signal/bcast operations have been improved by noting that they need not avoid inspecting the cond var's memory after changing the futex value. because the standard allows spurious wakeups, there is no way for an application to distinguish between a spurious wakeup just before another thread called signal/bcast, and the deliberate wakeup resulting from the signal/bcast call. thus the woken thread must assume that the signalling thread may still be waiting to act on the cond var, and therefore it cannot destroy/unmap the cond var. |
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| WHATSNEW | ||
musl libc - a new standard library to power a new generation of
Linux-based devices. musl is lightweight, fast, simple, free, and
strives to be correct in the sense of standards-conformance and
safety.
musl is an alternative to glibc, eglibc, uClibc, dietlibc, and klibc.
For reasons why one might prefer musl, please see the FAQ and libc
comparison chart on the project website,
http://www.etalabs.net/musl/
For installation instructions, see the INSTALL file.
Please refer to the COPYRIGHT file for details on the copyright status
of code included in musl, and the COPYING file for the license (LGPL)
under which the library as a whole is distributed.
Greetings!
As of the 0.8.0 release, musl is in _beta_ status. While some
interfaces remain incomplete or yet to be implemented, the ABI is
intended to be stable at this point, and serious efforts have been
made, using three separate test frameworks, to verify the correctness
of the implementation. Many major system-level and user-level programs
are known to work with musl, either out-of-the-box or with minor
patches to address portability errors; the main remaining applications
which definitely will not work are those which require C++ support,
which will be addressed during the 0.8 or 0.9 development series.
Included with this package is a gcc wrapper script (musl-gcc) which
allows you to build musl-linked programs using an existing gcc 4.x
toolchain on the host. There are also now at least two mini
distributions (in the form of build scripts) which provide a
self-hosting musl-based toolchain and system root: Sabotage Linux and
Bootstrap Linux. These are much better options than the wrapper script
if you wish to use dynamic linking or build packages with many library
dependencies.
The musl project is actively seeking contributors, mostly in the areas
of porting, testing, and application compatibility improvement. For
bug reports, support requests, or to get involved in development,
please visit #musl on Freenode IRC or subscribe to the musl mailing
list by sending a blank email to musl-subscribe AT lists DOT openwall
DOT com.
Thank you for using musl.
Cheers,
Rich Felker / dalias